US3860679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extruding filaments having asymmetric cross-section
Assignee: Celanese Corp
•
Filing: 1973-01-29
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Granted: 1975-01-14
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Expires: 1993-01-29
Abstract
Abstract A process to reduce kneeing during the melt spinning of continuous filaments through a T-shaped orifice by selecting dimensions of the orifice so that its extrusion factor is within a defined range.
Inventors
- 👤 Byar Hazim Shemdin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:15
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/12; B29C48/25; B29C48/30; B29C48/345; D01D5/00; D01D5/253
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
PROCESS FOR PRODUCING A SPINERETTE FOR EXTRUDING FILAMENTFORMING MATERIAL HAVING AT LEAST ONE ASYMMETRICALLY SHAPED ORIFICE THEREIN WHEREIN FILAMENT KNEEING AT SAID ASYMMETRICALLY SHAPED ORIFICE IS REDUCED WHICH COMPRISES, A. EXTRUDING FILAMENT-FORMING MATERIAL THROUGH A PLURALITY OF ORIFICES OF THE SAME ASYMMETRICAL SHAPE AND DIFFERENT ORIFICE DIMENSIONS; B. MEASURING THE KNEE ANGLES FORMED BY THE FILAMENTFORMING MATERIALS DURING EXTRUSION THROUGH EACH OF SAID ORIFICES; D. PLOTTING THE KNEE ANGLE AGAINST THE EXTRUSION FACTOR FOR EACH OF SAID ORIFICES WHEREBY A SMOOTH CURVE MAY BE DRAWN; D. SELECTING THE EXTRUSION FACTOR CORRESPONDING TO THE ZERO KNEE ANGLE; AND E. MANUFACTURING A SPINNERETTE PLATE HAVING ORIFICE DIMENSIONS CORRESPONDING TO SAID LAST-MENTIONED EXTRUSION FACTOR.
Claim 2
Dependent Claim
111 words
PROCESS FOR PRODUCING A SPINERETTE FOR EXTRUDING FILAMENTFORMING MATERIAL HAVING AT LEAST ONE ASYMMETRICALLY SHAPED ORIFICE THEREIN WHEREIN FILAMENT KNEEING AT SAID ASYMMETRICALLY SHAPED ORIFICE IS REDUCED WHICH COMPRISES, A. EXTRUDING FILAMENT-FORMING MATERIAL THROUGH A PLURALITY OF ORIFICES OF THE SAME ASYMMETRICAL SHAPE AND DIFFERENT ORIFICE DIMENSIONS; B. MEASURING THE KNEE ANGLES FORMED BY THE FILAMENTFORMING MATERIALS DURING EXTRUSION THROUGH EACH OF SAID ORIFICES; D. PLOTTING THE KNEE ANGLE AGAINST THE EXTRUSION FACTOR FOR EACH OF SAID ORIFICES WHEREBY A SMOOTH CURVE MAY BE DRAWN; D. SELECTING THE EXTRUSION FACTOR CORRESPONDING TO THE ZERO KNEE ANGLE; AND E. MANUFACTURING A SPINNERETTE PLATE HAVING ORIFICE DIMENSIONS CORRESPONDING TO SAID LAST-MENTIONED EXTRUSION FACTOR.
Claim 3
Dependent Claim
14 words
Process according to claim 1 wherein the asymmetrically-shaped orifice therein is a T-shaped orifice.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |